Two-Dimensional TLC with Adsorbent Gradient for Separation of Quinolizidine Alkaloids in the Herb and In-Vitro Cultures of Several Genista Species

JPC – Journal of Planar Chromatography – Modern TLC - Conditions have been established for TLC separation of a mixture of nine quinolizidine alkaloid standards (lupanine,...     

Crystallization behavior of ternary γ–γ′ Co–Al–W alloy

Journal of Thermal Analysis and Calorimetry - In the investigation, crystallization behavior of ternary γ–γ′ alloy based on Co–Al–W system was analyzed. The alloy...     

TLC with an Adsorbent Gradient for the Analysis of Taxol in Taxus baccata L.

JPC – Journal of Planar Chromatography – Modern TLC - TLC with a stationary-phase gradient has been used for purification and quantitative analysis of taxol in the needles and stems of...     

Initial Steps of Amyloidogenic Peptide Assembly Revealed by Cold‐Ion Spectroscopy

The early stages of fibril formation are difficult to capture in solution. We use cold‐ion spectroscopy to examine an 11‐residue peptide derived from the protein transthyretin and clusters of this fibre‐forming peptide containing up to five units in the gas phase. For each oligomer, the UV spectra exhibit distinct changes in the electronic environment of aromatic residues in this peptide compared to that of the monomer and in the bulk solution. The UV spectra of the tetra‐ and pentamer are superimposable but differ significantly from the spectra of the monomer and trimer. Such a spectral evolution suggests that a common structural motif is formed as early as the tetramer. The presence of this stable motif is further supported by the low conformational heterogeneity of the tetra‐ and pentamer, revealed from their IR spectra. From comparison of the IR‐spectra in the gas and condensed phases, we propose putative assignments for the dominant motif in the oligomers.     

Evaluation of thermal properties of MMCp composites with silver alloy matrix

Journal of Thermal Analysis and Calorimetry - Silver, silver alloys, and composites with silver matrix are used mainly as electric contacts, circuit-breakers, and slide bearings. Contacts working...